MiR-142-5p act as an oncogenic microRNA in colorectal cancer: Clinicopathological and functional insights.
Exp Mol Pathol 2018;
104:98-107. [PMID:
29337244 DOI:
10.1016/j.yexmp.2018.01.006]
[Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 01/10/2018] [Indexed: 12/31/2022]
Abstract
OBJECTIVES
miR-142-5p was noted aberrantly expressed and plays important roles in different pathophysiological conditions in human. The present study aims to examine the expression of miR-142-5p and its association with clinicopathological factors in a large cohort of patients with colorectal cancer. In addition, the cellular effects of miR-142-5p and its interacting targets in colon cancer cells were investigated.
METHODS
Expression of miR-142-5p in colorectal cancer tissues (n=125) and colon cancer cell lines were analysed using real-time polymerase chain reaction. In vitro assays (cell proliferation, wound healing and colony formation) were used to study the miR-142-5p induced cellular effects. Western blots were used to examine the modulation of FAM134B, KRAS, EPAS1 and KLF6 proteins expression followed by miR-142-5p expression-manipulation.
RESULTS
Significant high expression of miR-142-5p was noted in cancer tissues and cells when compared to the controls (p<0.001). Overexpression of miR-142-5p in patients with colorectal cancer was common (72%; 90/125). miR-142-5p overexpression was associated with cancer in the proximal colorectum and with B-raf positive patients (p=0.05). Exogenous overexpression of miR-142-5p resulted in significantly increased cell proliferation, colony formation, and wound healing capacities, whereas inhibition of endogenous miR-142-5p led reduced cancer growth properties. The cellular effects of miR-142-5p were mediated by the modulation of tumour suppressor KLF6 expression, as the expression of miR-142-5p and KLF6 protein are inversely correlated in colon cancer cells.
CONCLUSION
High miR-142-5p expression was associated with the biological aggressiveness of cancer. Thus, suppression of miR-142-5p could be a therapeutic strategy for patients with colorectal cancers.
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